CVE-2026-93861 Missing authorization in Mistral
Attackers can bypass workflow sharing restrictions to read and execute private workflows from other projects without owner consent.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93861?
CVE-2026-93861 is a medium-severity missing authorization vulnerability in OpenStack Mistral, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In OpenStack Mistral through 23.0.0, the workflow membership API lets a project that has accepted a share of another project's private workflow create a further membership naming a third project. The new membership row is created with its project_id defaulted to the accepting project rather than the original workflow owner, and thus the owner can neither see nor delete it. The third project can accept this membership (that it had not actually been granted by the owner), and then read and execute the owner's private workflow; only the accepting (not the owning) project can later revoke that access.
Weakness: CWE-863
Which versions are affected by CVE-2026-93861?
How do I fix CVE-2026-93861?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-93861 being exploited?
There is no known exploitation of CVE-2026-93861 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93861, GHSA-p254-mh9p-hpfm, UBUNTU-CVE-2026-93861.